NEW ZEALAND ELECTRICAL CODE OF PRACTICE. for ELECTRICAL SAFE DISTANCES

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1 NZECP 34:2001 ISSN NEW ZEALAND ELECTRICAL CODE OF PRACTICE for ELECTRICAL SAFE DISTANCES

2 NZECP 34:2001 NEW ZEALAND ELECTRICAL CODE OF PRACTICE for ELECTRICAL SAFE DISTANCES Issued by: Manager, Standards and Safety, Ministry of Consumer Affairs, Wellington, New Zealand

3 THE ELECTRICITY ACT 1992 Approval of the New Zealand Electrical Code for Practice for Electrical Safe Distances 2001 (NZECP 34:2001) and the revocation of the New Zealand Electrical Code of Practice for Electrical Safety Distances 1993 (NZECP 34:1993) Pursuant to section 38 of the Electricity Act 1992, I hereby revoke the New Zealand Electrical Code of Practice for Electrical Safety Distances 1993 (NZECP 34:1993) and approve the New Zealand Electrical Code of Practice for Electrical Safe Distances 2001 (NZECP 34:2001). The New Zealand Electrical Code of Practice for Electrical Safe Distances 2001 (NZECP 34:2001 was published by the Manager, Standards and Safety, Ministry of Consumer Affairs, acting under delegated authority (pursuant to section 41 of the State Sector Act 1988) from the Chief Executive, Ministry of Economic Development on the 3 rd day of August Dated this 21 st day of December Minister of Energy

4 COMMITTEE REPRESENTATION This Code of Practice was prepared by the Ministry of Consumer Affairs, in consultation with the following: The Building Industry Authority Transpower New Zealand Ltd Electricity Engineers Association of NZ (Inc) Institution of Professional Engineers NZ Tranz Rail Ltd Telecom NZ Ltd Telstra Saturn REVIEW This Code of Practice will be revised as occasions arise. Suggestions for improvements of this Code are welcome. They should be sent to the Manager, Standards and Safety, Ministry of Consumer Affairs, PO Box 1473, Wellington.

5 CONTENTS INTRODUCTION 1 SECTION 1 2 SCOPE, INTERPRETATION, GLOSSARY AND GENERAL SCOPE INTERPRETATION GLOSSARY OF ABBREVIATIONS USED IN THIS CODE...3 SECTION 2 4 MINIMUM SAFE DISTANCES FOR EXCAVATION AND CONSTRUCTION NEAR OVERHEAD ELECTRIC LINE SUPPORTS GENERAL EXCAVATION NEAR OVERHEAD ELECTRIC LINE SUPPORTS INSTALLATION OF CONDUCTIVE FENCES NEAR OVERHEAD ELECTRIC LINE SUPPORTS CONSTRUCTION OF BUILDINGS AND SIMILAR STRUCTURES NEAR OVERHEAD ELECTRIC LINE SUPPORTS...5 SECTION 3 8 SAFE DISTANCE REQUIREMENTS BETWEEN CONDUCTORS AND BUILDINGS (AND OTHER STRUCTURES) GENERAL PROCESS FOR ESTABLISHING SAFE DISTANCES SAFE DISTANCES FROM CONDUCTORS WITHOUT ENGINEERING ADVICE MINIMUM SAFE DISTANCES OF CONDUCTORS FROM BUILDINGS AND OTHER STRUCTURES WITH SPECIFIC ENGINEERING ADVICE...10 SECTION 4 12 SAFE DISTANCES OF CONDUCTORS FROM THE GROUND AND WATER GENERAL MINIMUM SAFE DISTANCES OF CONDUCTORS FROM THE GROUND AND POOLS MATERIAL DEPOSITED UNDER OR NEAR OVERHEAD ELECTRIC LINES SAFE DISTANCES OF CONDUCTORS OVER NAVIGABLE WATERWAYS AND BOAT RAMPS SAFE DISTANCES OF CONDUCTORS OVER RAILWAY TRACKS...14 SECTION 5 15 SAFE DISTANCES FOR THE OPERATION OF MOBILE PLANT NEAR CONDUCTORS GENERAL MINIMUM APPROACH DISTANCE WORKING ABOVE OVERHEAD ELECTRIC LINES CONSENT FOR REDUCED MINIMUM APPROACH DISTANCES REDUCED MINIMUM APPROACH DISTANCES FOR COMPETENT EMPLOYEES OTHER REQUIREMENTS...16 Page

6 SECTION 6 18 MINIMUM SAFE DISTANCES BETWEEN CONDUCTORS OF DIFFERENT CIRCUITS, TELECOMMUNICATION LINES AND STAY WIRES GENERAL CONDUCTORS OF DIFFERENT CIRCUITS ON DIFFERENT SUPPORTS (UNATTACHED CROSSINGS) CONDUCTORS (SAME OR DIFFERENT CIRCUITS) ON THE SAME SUPPORT (ATTACHED CROSSINGS ) INCLUDING SHARED SPANS TELECOMMUNICATION LINES NEAR CONDUCTORS AND STAY WIRES...19 SECTION 7 21 DESIGN AND INSTALLATION REQUIREMENTS FOR SUPPORTS AND STAY WIRES OF OVERHEAD ELECTRIC LINES, AND CONTROL OF ACCESS SUPPORTS STAY WIRES CONTROL OF ACCESS...21 SECTION 8 22 SAFE DISTANCES FOR THE DESIGN OF SUBSTATIONS, GENERATING STATIONS, SWITCHYARDS AND SWITCHROOMS GENERAL METALCLAD SWITCHGEAR BARE CONDUCTORS WITHIN EARTHED ENCLOSURES BARE CONDUCTORS IN SUBSTATIONS, SWITCHYARDS, GENERATING STATION BUILDINGS AND OTHER LOCATIONS...22 SECTION 9 23 MINIMUM SAFE APPROACH DISTANCE LIMITS FOR PERSONS WORKING NEAR EXPOSED LIVE PARTS GENERAL MINIMUM APPROACH DISTANCE LIMITS FOR NON COMPETENT PERSONS WORKING NEAR EXPOSED LIVE PARTS MINIMUM SAFE APPROACH DISTANCE LIMITS FOR COMPETENT EMPLOYEES FROM EXPOSED LIVE PARTS...24 SECTION REQUIREMENTS FOR INSPECTION AND RECORDS INSPECTION RECORDS...25

7 TABLES TABLE 1 MINIMUM SAFE DISTANCES BETWEEN BUILDINGS AND OVERHEAD ELECTRIC LINE SUPPORT STRUCTURES... 5 TABLE 2 SAFE DISTANCES FROM CONDUCTORS WITHOUT ENGINEERING ADVICE... 9 TABLE 3 MINIMUM SAFE DISTANCES OF CONDUCTORS FROM BUILDINGS AND OTHER STRUCTURES WHERE SPECIFIC CALCULATION OF CONDUCTOR MOVEMENT HAS BEEN CARRIED OUT TABLE 4 MINIMUM SAFE DISTANCES OF CONDUCTORS FROM THE GROUND.. 13 TABLE 5 MINIMUM DISTANCES VERTICALLY ABOVE RAILWAY TRACKS TABLE 6 REDUCED MINIMUM APPROACH DISTANCES (where written consent has been obtained) TABLE 7 MINIMUM VERTICAL DISTANCES BETWEEN CONDUCTORS (unattached crossings) TABLE 8 MINIMUM SAFE DISTANCES BETWEEN CONDUCTORS (attached crossings) TABLE 9 MINIMUM SAFE APPROACH DISTANCE LIMITS FOR PERSONS FROM EXPOSED LIVE PARTS (Where consent from the owner of the live parts has been obtained) TABLE 10 MINIMUM SAFE APPROACH DISTANCE LIMITS FOR COMPETENT EMPLOYEES FROM EXPOSED LIVE PARTS FIGURES FIGURE 1 MINIMUM SAFE DISTANCES FOR EXCAVATION AND CONSTRUCTION NEAR POLES OR STAY WIRES... 6 FIGURE 2 MINIMUM SAFE DISTANCES FOR EXCAVATION AND CONSTRUCTION NEAR TOWERS... 7 FIGURES 3 AND 4 BUILDING ELEVATION AND BALCONY SECTION FIGURE 5 MINIMUM SAFE DISTANCES FOR THE OPERATION OF MOBILE PLANT NEAR CONDUCTORS FIGURE 6 MEASUREMENT OF MINIMUM SAFE APPROACH DISTANCES... 24

8 INTRODUCTION 1 This Electrical Code of Practice (Code) sets minimum safe electrical distance requirements for overhead electric line installations and other works associated with the supply of electricity from generating stations to end users. The minimum safe distances have been set primarily to protect persons, property, vehicles and mobile plant from harm or damage from electrical hazards. The minimum distances are also a guide for the design of electrical works within substations, generating stations or similar areas where electrical equipment and fittings have to be operated and maintained. The Code has been designed to include, in its various sections, requirements that were previously contained in the Electricity Regulations 1997 (the Regulations). Compliance with this Code is mandatory. Section 1 is a general section, including this Code s scope, interpretation and glossary. Sections 2 and 3 cover the safe distance requirements for building works and excavation near overhead electric line support structures. It also covers the construction of buildings and other structures near conductors and the installation of conductors near existing buildings and similar structures. Section 4 covers the requirements for maintaining safe distances between conductors and the ground and water, including restrictions on material being deposited under or near conductors. Section 5 covers the responsibilities of parties who work or operate mobile plant near overhead electric lines and other electrical works. Sections 6 8 cover the requirements for safe design and installation of overhead electric and telecommunications systems and other electrical works and controls on access to conductors. Section 9 covers minimum safe approach distance requirements for persons working near exposed live parts. Section 10 covers the responsibilities of owners of electricity supply works for inspection and maintaining records. 2001

9 SECTION 1 SCOPE, INTERPRETATION, GLOSSARY AND GENERAL SCOPE This Code covers safety issues, in so far as they relate to safe distances to overhead electric lines, telecommunication lines, line equipment and fittings, and personnel working on or near to such lines equipment This Code sets out minimum requirements in respect of the following matters: (a) Excavations or construction near overhead electric line supports; (b) Limits for construction near conductors; (c) Limits for the installation of conductors near existing buildings and similar structures; (d) The separation and height of conductors above ground etc; (e) The separation of overhead telecommunications lines and conductors; (f) Overhead electric line access, supports and stays; (g) Limits on material deposited or placed under or near an overhead electric line; (h) Operation of mobile plant near conductors; (i) Safe distances for the design of substations, switchyards and switchboards; (j) Minimum approach distances to exposed live parts; and (k) Inspection and records The content of this Code does not exempt any person from compliance with any statutory requirements in respect of the matters in clause This Code does not apply to: (a) Distance limits for large loads (e. g. buildings and over-dimension loads) travelling down roads. (b) Optical fibre ground wire or optical fibre cables that are contained in or wrapped around any conductor. (c) Hazards from trees INTERPRETATION The Electricity Act 1992 and the Electricity Regulations 1997 contain definitions that are to be used in conjunction with this Code. These include: associated equipment; direct contact; electrically safe; exposed conductive part; fittings; high voltage; indirect contact; insulated; live or alive; live part; low voltage, and works. In this Code, unless the context otherwise requires: Bare conductor - means a conductor without covering or not insulated Competent employee means an employee who can demonstrate to their employer, at any time, that they have the necessary knowledge, skills and experience to carry out electrical or telecommunications work in the vicinity of overhead electric lines, or exposed live metal, safely and to the standards used by the employer Conductor means a wire, cable or form of metal designed for carrying electric current but does not include the wire of an electric fence Distance (for conductors) - unless otherwise specified, means the distance under the worst case 2001

10 3 combination of maximum sag, load current, solar radiation, climatic conditions, etc, and in which the conductor creep process is complete (in the case of a line crossing another line, the worst case is that which results in the minimum spacing between the two lines) Mobile plant - means cranes, elevating work platforms, tip trucks or similar plant, irrigation booms, any equipment fitted with a jib or boom and any device capable of being raised and lowered Overhead electric line means conductors and support structures Telecommunication line - means any overhead wire or wires or conductors of any kind (including a fibre optic cable) used or intended to be used for the transmission or reception of signs, signals, impulses, writing, sounds or intelligence of any nature by means of any electromagnetic system. It includes any pole, insulator, casing, fixture, or other equipment used or intended to be used for supporting, enclosing, surrounding, or protecting any such wire or conductor; and also includes any part of a line Traction systems - means any overhead conductor or fitting for any train, locomotive, tram, trolley bus or electric overhead travelling crane GLOSSARY OF ABBREVIATIONS USED IN THIS CODE a.c. d.c. LV kv m mm V Alternating current Direct current Low voltage Kilovolts Metres Millimetres Volts 2001

11 SECTION 2 MINIMUM SAFE DISTANCES FOR EXCAVATION AND CONSTRUCTION NEAR OVERHEAD ELECTRIC LINE SUPPORTS GENERAL This section outlines the requirements for building or excavation near overhead electric line support structures (towers, poles and stay wires). The minimum safe distances are designed to limit the chance of damage or hazards being created by the building or excavation. The minimum distances also ensure that the support structures can be accessed for inspection and maintenance Excavations and other works near overhead electric line supports can compromise the structural integrity of the overhead electric line Metallic or conducting paths near overhead electric line supports can transfer voltage potentials that could create step and touch currents during earth fault conditions Any consent and associated conditions given under this section shall be reasonable, and shall not be unreasonably withheld. 2.2 EXCAVATION NEAR OVERHEAD ELECTRIC LINE SUPPORTS Subject to clause 2.2.2, prior written consent of the pole owner shall be obtained for any excavation or other interference with the land near any pole or stay wire of an overhead electric line where the work: (a) is at a greater depth than 300mm within 2.2 m of the pole or stay wire of the line; or (b) is at a greater depth than 750 mm between 2.2 m and 5 m of the pole or stay wire; or (c) creates an unstable batter Clause does not apply to vertical holes, not exceeding 500 mm diameter, beyond 1.5 m from a pole or stay wire Prior written consent of the tower owner shall be obtained for any excavation or other interference with the land near any tower supporting an overhead electric line where the work: (a) is at a greater depth than 300 mm within 6 m of the outer edge of the visible foundation of the tower; or (b) is at a greater depth than 3 m between 6 m and 12 m of the outer edge of the visible foundation of the tower; or (c) creates an unstable batter Nothing in clauses applies in respect of normal agricultural cultivation or the repair, sealing, or resealing of the existing surface of any road, footpath, or driveway Figures 1 and 2 provide a quick reference to the minimum safe distances for excavation near overhead electric line supports. 2.3 INSTALLATION OF CONDUCTIVE FENCES NEAR OVERHEAD ELECTRIC LINE SUPPORTS Fences of conductive materials shall not be attached to any tower or conductive pole of a high voltage overhead electric line Fences of conductive materials should not be constructed within 2.2 m of any tower or conductive pole of a high voltage overhead electric line between 1 kv - 50 kv Except with the prior written consent of the overhead electric line owner, fences of conductive

12 5 materials shall not be constructed within 5 m of any tower or conductive pole of a high voltage overhead electric line of 66 kv or greater. As part of the consent, the overhead electric line owner may prescribe the design of any such fence to be constructed within this 5 m distance Where the construction of an overhead electric line would cause a contravention of the principles of clause 2.3.3, the line owner shall, at the line owner s cost, carry out an engineering study and undertake such remedial work as is necessary to maintain electrical safety Figures 1 and 2 provide a quick reference to the minimum safe distances for installation/ construction of conductive fences near overhead electric line supports. 2.4 CONSTRUCTION OF BUILDINGS AND SIMILAR STRUCTURES NEAR OVERHEAD ELECTRIC LINE SUPPORTS Except with the prior written consent of the overhead electric line owner, no building or similar structure shall be erected closer to a high voltage overhead electric line support structure than the distances specified in Table 1. The distances in Table 1 are to be measured from the closest visible edge of the overhead electric line support foundation, and the nearest part of the outermost part of the building. Refer to section 3 of this code for minimum safe distances between buildings (and other structures) and conductors. TABLE 1 MINIMUM SAFE DISTANCES BETWEEN BUILDINGS AND OVERHEAD ELECTRIC LINE SUPPORT STRUCTURES Circuit Voltage Pole Tower (pylon) 11 kv to 33 kv 2 m 6 m Exceeding 33 kv to 66 kv 6 m 9 m Exceeding 66 kv 8 m 12 m Figures 1 and 2 provide a quick reference to the minimum safe distance requirements for the construction of buildings and other structures near overhead electric line supports.

13 2. 5m 5m 8m 2m 2. ANY WORKS Prior written consent from line owner required for excavation or interference with any land near a pole or stay wire of an overhead electric line where the work creates an unstable batter. Section (c) ANY WORKS Prior written consent from line owner required for excavation or interference with any land at a greater depth than 750mm between 2.2m and 5m of a pole or stay wire of an overhead electric line* Section (b) CONSTRUCTION Except with the prior written consent of the line owner, no building or similar structure shall be erected closer to a pole or staywire than: - 2.2m (11 kv- 33 kv lines) - 6m (33 kv - 66 kv lines) - 8m (Exceeding 66 kv) Distances to be measured from closest visible edge of an pole foundation, and the nearest part of the outer most part of the building. Section Table 1 300mm 300mm ection 2 for the complete safe distance requirements metres metres 6 8m 5m 2.2m Pole Plan View (not to scale) 750mm CES FEN ANY WORKS Prior written consent from pole owner required for excavation or interference with any land at a greater depth than 300mm within 2.2m of the pole or stay wire of an overhead electric line* Section (a) Conductive fences should not be constructed within 2.2m of any conductive pole of a high voltage overhead electric line between 1 kv - 50 kv FIGURE 1 MINIMUM SAFE DISTANCES FOR EXCAVATION AND CONSTRUCTION NEAR POLES OR STAY WIRES 2m 8m 750mm Ground level metres 0-5 metres Section FENCES Prior written consent from line owner required to construct conductive fences within 5m of a conductive pole of a high voltage overhead electric line of 66 kv or greater. The line owner may prescribe the design of such a fence Section FENCES Conductive fences shall not be attached to any conductive pole of a high voltage overhead electric line. Section Side View (not to scale) Notes This diagram is for quick reference only. Please refer to S Nothing in clauses applies in respect of normal agricultural cultivation or the repair, sealing, or resealing of the existing surface of any road, footpath, or driveway (Section 2.2.4). * Clause does not apply to vertical holes, not exceeding 500 mm diameter, beyond 1.5m from the pole or stay wire.

14 5m 6m 5m FIGURE 2 MINIMUM SAFE DISTANCES FOR EXCAVATION AND CONSTRUCTION NEAR TOWERS ANY WORKS Prior written consent from tower owner required for excavation or interference with any land near any tower supporting an overhead electric line where the work is at a greater depth than 300mm within 6m of the outer edge of the visible foundation of the tower Section 2.2.3(a) 7 12m 9m 6m 5m Plan View (not to scale) ANY WORKS Prior written consent of the tower owner required for any excavation or other interference with the land near any tower supporting an overhead electric line where the work creates an unstable batter Section 2.2.3(c) Notes m0m 30 This diagram is for quick reference only. Please refer to Sect ANY WORKS Prior written consent of the tower owner required for any excavation or other interference with the land near any tower supporting an overhead electric line where the work is at a greater depth than 3m, between 6-12m of the outer edge of the visible foundation of the tower Section 2.2.3(b) CONSTRUCTION Except with the prior written consent of the line owner, no building or similar structure shall be erected closer to a tower of an overhead electric line than: - 6m (11-33 kv lines) - 9m (33-66 kv lines) - 12m (Exceeding 66 kv) Distances to be measured from the closest visible edge of a tower, and the nearest part of the outermost part of the building Section Table 1 12m 3m 9m 6-12 metres 0-6 metres 2m Ground level Side View (not to scale) ion 2 for the complete safe distance requirements. Nothing in clauses applies in respect of normal agricultural cultivation or the repair, sealing, or resealing of the existing surface of any road, footpath, or driveway (Section 2.2.4). 2m Tower 0-2 metres 0-5 metres 2m m0m 30 6m 9m 3m 12m FENCES Conductive fences shall not be attached to any tower of a high voltage overhead electric line Section FENCES Conductive fences should not be constructed within 2m of any tower of a high voltage overhead electric line between 1 kv - 66 kv Section FENCES Prior written consent from line owner required to construct conductive fences within 5m of any tower of a high voltage overhead electric line of 66 kv or greater. The line owner may prescribe the design of such a fence Section 2.3.3

15 SECTION 3 SAFE DISTANCE REQUIREMENTS BETWEEN CONDUCTORS AND BUILDINGS (AND OTHER STRUCTURES) GENERAL This section sets safe distance requirements for the construction of buildings and other structures near existing conductors, to prevent inadvertent contact with or close approach to conductors. At higher voltages, contact may be made via a power discharge across the gap This section also sets safe distance requirements for the location and construction of conductors near existing buildings and other structures The construction of buildings, scaffolding and other structures shall be in accordance with the Building Code This section does not apply to telecommunications lines. 3.2 PROCESS FOR ESTABLISHING SAFE DISTANCES Prior to any planned construction, the following process must be undertaken to comply with the Code. The landowner/ building owner shall: Establish, if necessary with the assistance of the overhead electric line owner, whether the proposed building/structure is at a greater distance from the conductor than the recommended distances for new buildings from conductors under normal conditions specified in Table If the proposed building/structure is at a greater distance, then no further action is required by the building owner to comply with this section of the Code with regard to conductor distances If the proposed building/structure does not (or may not) comply with the requirements of Table 2, then the overhead electric line owner shall be consulted. A specific engineering study must be carried out by a competent person, to establish actual distances in accordance with the requirements of Table 3 (refer section 3.3). Table 3 sets out the minimum safe distances (which are closer than those specified in Table 2) under worst case conditions Based on the outcome of the engineering study, which shall be provided by the landowner/building owner, the overhead electric line owner will advise whether:- (i) (ii) (iii) the proposed building/structure complies with Table 3 and construction can proceed without restriction; or temporary arrangements during building construction need to be made, with the written agreement of the overhead electric line owner, to restrain conductor movement or to provide suitable insulation that will allow closer approach to conductors than those specified in Table 2. As part of the written agreement, the overhead electric line owner may prescribe reasonable conditions for the temporary arrangements; or the proposed building/structure does not comply with Table 3 requirements, and therefore construction is prohibited For any overhead electric line owner planning to build a new conductor near to an existing building, a similar process to that set out in clause must be followed, the costs of any

16 9 necessary engineering study being borne by the line owner. 3.3 SAFE DISTANCES FROM CONDUCTORS WITHOUT ENGINEERING ADVICE Table 2 sets out the safe distances from conductors under normal conditions without engineering advice for conductor spans up to 375 m with supporting structures at equal elevation. TABLE 2 SAFE DISTANCES FROM CONDUCTORS WITHOUT ENGINEERING ADVICE Circuit voltage Maximum span length (m) Minimum distance beneath conductors under normal conditions (m) Minimum distance to the side of conductors under normal conditions (m) Not exceeding 1 kv Exceeding 1 kv but not exceeding 11kV Exceeding 11 kv but not exceeding 33 kv Exceeding 33 kv but not exceeding 110 kv Exceeding 110 kv but not exceeding 220 kv kv d.c. & 350 kv d.c Not exceeding 33 kv Exceeding 33 kv but not exceeding 110 kv Exceeding 110 kv but not exceeding 220 kv kv d.c. & 350 kv d.c Not exceeding 33 kv Exceeding 33 kv but not exceeding 110 kv Exceeding 110 kv but not exceeding 220 kv kv d.c. & 350 kv d.c For all other spans Engineering advice required (voltages are a.c. except where specified as d.c.) NOTES (a) Observance of potential conductor motion is required to ensure safe distances during construction. (b) Where supporting structures are not located on equal elevations, a specific engineering study may be required to ensure distances are in accordance with Table 3.

17 MINIMUM SAFE DISTANCES OF CONDUCTORS FROM BUILDINGS AND OTHER STRUCTURES WITH SPECIFIC ENGINEERING ADVICE Table 3 sets out the minimum safe distance of distances for conductors from buildings and other structures where a detailed engineering assessment has been carried out The minimum safe distances from a conductor of an overhead electric line to any structure, building or line support (other than a support for the line under consideration or any line crossing the line under consideration) shall not be less than those specified in Table The Table 3 distances do not apply to insulated conductors or cables supported along the façade of a structure or building Figures 3 and 4 illustrate the application of the Table 3 to a particular building. The letters A to D refer to the distances A to D as set out in Table The distances specified in A and B of Table 3 shall also be maintained above an imaginary horizontal line extending outward for the distance specified in C For Figure 4, the greater distance of either A, or B (from Table 3) plus the height of the balcony, shall apply, as this latter calculation may result in a distance greater than A. FIGURES 3 AND 4 BUILDING ELEVATION AND BALCONY SECTION D B C D A B C C C A Opening Window C FIGURE 4 BALCONY SECTION D FIGURE 3 BUILDING ELEVATION

18 TABLE 3 11 MINIMUM SAFE DISTANCES OF CONDUCTORS FROM BUILDINGS AND OTHER STRUCTURES WHERE SPECIFIC CALCULATION OF CONDUCTOR MOVEMENT HAS BEEN CARRIED OUT A Safe distance conditions Vertically above those parts of any structure normally accessible to persons B Vertically above those parts of any structure not normally accessible to persons but on which a person can stand C In any direction (other than vertically above) from those parts of any structure normally accessible to persons, or from any part not normally accessible to persons but on which a person can stand D In any direction from those parts of any structure not normally accessible to persons E In any direction from the ground Insulated m Not exceeding 1 kv Bare neutral m Bare active m Exceeding 1 kv Insulated with earthed screen m Insulated without earthed screen m Exceeding 1 kv but not exceeding 33 kv Bare or covered m Exceeding 33 kv but not exceeding 110 kv Bare m Exceeding 110 kv but not exceeding 220 kv Bare m Exceeding 220 kv a.c. or d.c * 0. 3* 0. 6* Refer to Table 4 * This distance can be further reduced to allow for termination at the point of attachment Bare m

19 SECTION 4 SAFE DISTANCES OF CONDUCTORS FROM THE GROUND AND WATER GENERAL This section sets the minimum safe clearance distances for conductors from the ground and water, including minimum safe distances for any excavations or other alterations Unless specifically identified, the requirements of this section do not apply to traction system conductors or to telecommunications lines, substations and generating stations. 4.2 MINIMUM SAFE DISTANCES OF CONDUCTORS FROM THE GROUND AND POOLS Conductors of any overhead electric line, including any switching connections and transformer connections mounted on poles or structures, shall have distances from the ground not less than specified in Table Table 4 does not apply to existing overhead electric line conductors, or their replacement, where those conductors complied with the Regulations in existence at the time of their installation Conductors shall not be installed less than 5 m above the water level of any swimming pool. 4.3 MATERIAL DEPOSITED UNDER OR NEAR OVERHEAD ELECTRIC LINES No material shall be deposited under or near an overhead electric line so as to reduce the conductor distance to ground to less than the distances required by Table 4 of this Code.

20 13 TABLE 4 MINIMUM SAFE DISTANCES OF CONDUCTORS FROM THE GROUND Circuit voltage Across or along roads or driveways Vertical distance to ground (m) Any other land traversable by vehicles (including mobile plant) but excluding across or along roads or driveways Any land not traversable by vehicles (including mobile plant) due to its inaccessibility (e.g. steepness or swampiness) Radial distance (m) In any direction other than vertical on all land Not Exceeding 1 kv and insulated Not Exceeding 1 kv Exceeding 1 kv but not exceeding 33 kv Exceeding 33 kv but not exceeding 110 kv Exceeding 110 kv but not exceeding 220 kv Exceeding 220 kv a.c. or d.c NOTES: (a) Voltages are a.c. except where specified as d.c. (b) The term ground includes any unroofed elevated area accessible to plant or vehicles. (c) Distances specified in Table 4 are for conductors that have fully undergone mechanical creep (permanent elongation). This is deemed to have occurred after 10 years in service.

21 SAFE DISTANCES OF CONDUCTORS OVER NAVIGABLE WATERWAYS AND BOAT RAMPS The height of conductors over a navigable waterway shall be determined in consultation with the Maritime Safety Authority of New Zealand (MSA). The booklet titled New Zealand System of Buoys and Beacons, produced by MSA, shall be used as a guide Where conductors are installed over a boat ramp, suitable notices shall be provided on either side of the ramp, to provide a warning of the conductors presence and an indication of the conductors height and voltage No overhead conductors shall be installed within 9 m in any direction of a boat ramp Overhead conductors installed between 9 and 12 m of a boat ramp shall be insulated No boat ramp shall be constructed within 9 m in any direction of an overhead electric line without prior written consent of the electric line owner. 4.5 SAFE DISTANCES OF CONDUCTORS OVER RAILWAY TRACKS The safe distances above rail level at the crossing of the railway for all overhead electric line conductors, when at maximum sag, shall not be less than those specified in Table 5. Where electric traction is in use, refer also to clause TABLE 5 MINIMUM DISTANCES VERTICALLY ABOVE RAILWAY TRACKS Conductors Distance (m) Earthed conductors 5.5 Stay wires 5.5 Conductors up to and including 33 kv 6.5 Conductors above 33 kv but not exceeding 220 kv 7.5 Conductors above 220 kv a.c. or d.c

22 15 SECTION 5 SAFE DISTANCES FOR THE OPERATION OF MOBILE PLANT NEAR CONDUCTORS 5.1 GENERAL This section does not apply to live line work or to any conductor forming part of the mobile plant or any collector wire, insulated cable, or flexible cord used for the purpose of supplying electricity to the mobile plant Mobile plant working near an electric overhead electric lines can damage the line and be hazardous for the plant operator, the mobile plant and people in the vicinity Conductors can be displaced from their normal position by wind or temperature change. This requires special consideration by mobile plant operators This section does not apply while mobile plant is in transit on a road and the relevant requirements of the Traffic Regulations 1976 are observed. 5.2 MINIMUM APPROACH DISTANCE The distance between any live overhead electric line and any part of any mobile plant or load carried shall be AT LEAST 4.0 METRES, unless the operator has received written consent from the overhead electric line owner allowing a reduced distance When an approval has been obtained pursuant to clause 5.2.1, and subject to clause 5.5.1, the minimum approach distance between a conductor and any mobile plant shall not be less than specified in Table Figure 5 provides a quick reference guide to the minimum safe distances for use of mobile plant near conductors of overhead electric lines. 5.3 WORKING ABOVE OVERHEAD ELECTRIC LINES Mobile plant or any load carried shall not operate above the conductors of any overhead electric line unless the operator has received written consent from the overhead electric line owner to work above the overhead electric line The use of helicopters above overhead electric lines is governed by the Civil Aviation Rules. 5.4 CONSENT FOR REDUCED MINIMUM APPROACH DISTANCES The application for written consent from the overhead electric line owner shall be made with reasonable notice The overhead electric line owner s written consent shall advise: (a) (b) (c) The voltage of the overhead electric line and the minimum approach distance to be observed, which shall not be less than the requirements of Table 6; and Any other reasonable conditions to be observed while working in proximity to, or above, the overhead electric line. The section of line to which the consent applies. 2001

23 16 TABLE 6 REDUCED MINIMUM APPROACH DISTANCES (where written consent has been obtained) Minimum approach Circuit voltage distance (m) Not exceeding 1 kv insulated conductor 0.15 Not exceeding 1 kv conductor not insulated 1.0 Exceeding 1 kv but not exceeding 66 kv 1.0 Exceeding 66 kv but not exceeding 110 kv a.c. or d.c. 1.5 Exceeding 110 kv but not exceeding 220 kv a.c. or d.c. 2.2 Exceeding 220 kv d.c. but not exceeding 270 kv d.c. 2.3 Exceeding 270 kv d.c. but not exceeding 350 kv d.c. 2.8 Exceeding 350 kv d.c. or 220 kv a.c REDUCED MINIMUM APPROACH DISTANCES FOR COMPETENT EMPLOYEES Where the operator of any mobile plant is a competent employee working on, or in the proximity of, an overhead electric line, the approach distances may be reduced in accordance with the safety practices determined by the overhead electric line owner Direct contact of insulated elevating work platform with live conductors shall be acceptable only under approved live working procedures. Whenever a special reduced minimum approach distance is applied, the maximum practicable clearance from conductors shall be maintained. 5.6 OTHER REQUIREMENTS Where any mobile plant is likely to be used at any time in the proximity of overhead electric lines, the owner or operator of such device shall affix an approved warning notice in a conspicuous place as near as practicable to the operator's position. The notice shall be maintained in a legible condition and shall state: "WARNING, KEEP CLEAR OF POWER LINES" Any mechanically operated hedge cutter used under or in close proximity to any overhead electric line shall be operated to prevent hedge clippings or other material being thrown into contact with the conductors or creating any other hazard. 2001

24 FIGURE 5 MINIMUM SAFE DISTANCES FOR THE OPERATION OF MOBILE PLANT NEAR CONDUCTORS 17 ALL WORKS The distance between any live overhead electric line and any mobile plant or load carried shall be at least 4m, unless the operator has written consent from the overhead electric line owner Section m Plan View (not to scale) WORKING ABOVE OVERHEAD LINES Written consent from line owner required for the operation of mobile plant or any load carried above the overhead electric line Section ALL WORKS - REDUCED DISTANCES When approval is obtained pursuant to clause 5.2.1, and subject to clause 5.5.1, the minimum approach distance between a conductor and any mobile plant shall not be less than specified in Table 6 Section metres 0-4 metres HEDGE CUTTERS Mechanically operated hedge cutters used in close proximity to overhead lines shall be operated to prevent hedge clippings or other material from being thrown into contact with the conductors or creating any other hazard Section REDUCED DISTANCES FOR COMPETENT EMPLOYEES Where the operator of any mobile plant is a competent employee working on, or near, an overhead electric line, approach distances may be reduced in accordance with safety practices determined by the electric line owner Section Conductors WARNING NOTICE Where mobile plant is likely to be used close to overhead electric lines, the owner or operator of such device shall affix a warning notice in a conspicuous place as near as practicable to the operator's position, stating: 'WARNING, KEEP CLEAR OF POWER LINES' Section Notes This diagram is for quick reference only. Please refer to Section 5 for the complete minimum safe distance requirements. Mobile Plant includes cranes, loaders, excavators, drilling or pile driving equipment or other similar device. The provisions of Section 5 do not apply to live line work or to any conductor forming part of the mobile plant or any collector wire, insulated cable, or flexible cord used for the purpose of supplying electricity to the mobile plant (section 5.1.1) or while mobile plant is in transit on a road and the relevant requirements of the Traffic Regulations 1976 are observed (section ).

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